Godot is a powerful cross-platform game engine
Open source HTML5 game framework that offers WebGL and Canvas
Real Time Strategy game engine supporting early Westwood classics
Open game and rendering engine packed into a JavaScript framework
Open Source MMORPG Framework
ThinkPHP Framework
Self-hosted CMS platform based on the Laravel PHP Framework
Open source library for creative expression on the web, desktop, etc.
Gideros Release version
Amateur 3D Game Engine
Old-school 2D game engine
Game engine supporting many 3D/2D formats and graphic effects
Arianne is an engine to develop multiplayer online games like Stendhal
Vivid3D is a C++ IDE/3D engine, with python scripting.
JavaScript framework to build game engines, games, emulators and apps
A free 3D game engine to create games and realtimes scenes for Windows
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
FreeCS is a free-software reimplementation of Counter-Strike 1.5.
The imaginary eight-bit machine
Free and Open Game Programming Language for Windows and GNU/Linux
Reactive extensions for Unity
An API for interacting with Starcraft: Brood War (1.16.1)